221203770242 has 24 divisors (see below), whose sum is σ = 415668625596. Its totient is φ = 87509183328.

The previous prime is 221203770233. The next prime is 221203770247. The reversal of 221203770242 is 242077302122.

It can be written as a sum of positive squares in 2 ways, for example, as 220204009081 + 999761161 = 469259^2 + 31619^2 .

It is a super-2 number, since 2×221203770242² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221203770199 and 221203770208.

It is not an unprimeable number, because it can be changed into a prime (221203770247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86813393 + ... + 86815940.

Almost surely, 2^221203770242 is an apocalyptic number.

221203770242 is a deficient number, since it is larger than the sum of its proper divisors (194464855354).

221203770242 is a wasteful number, since it uses less digits than its factorization.

221203770242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173629362 (or 173629355 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 32.

The spelling of 221203770242 in words is "two hundred twenty-one billion, two hundred three million, seven hundred seventy thousand, two hundred forty-two".